diff --git a/pysstv/tests/common.py b/pysstv/tests/common.py
new file mode 100644
index 0000000..005624f
--- /dev/null
+++ b/pysstv/tests/common.py
@@ -0,0 +1,4 @@
+from os import path
+
+def get_asset_filename(filename):
+    return path.join(path.dirname(__file__), 'assets', filename)
diff --git a/pysstv/tests/test_color.py b/pysstv/tests/test_color.py
index 38d3036..907074e 100644
--- a/pysstv/tests/test_color.py
+++ b/pysstv/tests/test_color.py
@@ -4,7 +4,8 @@ import pickle
 
 from PIL import Image
 
-import color
+from pysstv import color
+from common import get_asset_filename
 
 
 class TestMartinM1(unittest.TestCase):
@@ -12,16 +13,16 @@ class TestMartinM1(unittest.TestCase):
     def setUp(self):
         self.image = Image.new('RGB', (320, 256))
         self.s = color.MartinM1(self.image, 48000, 16)
-        lena = Image.open('tests/assets/320x256.png')
+        lena = Image.open(get_asset_filename('320x256.png'))
         self.lena = color.MartinM1(lena, 48000, 16)
 
     def test_gen_freq_bits(self):
-        expected = pickle.load(open("tests/assets/MartinM1_freq_bits.p"))
+        expected = pickle.load(open(get_asset_filename("MartinM1_freq_bits.p")))
         actual = list(islice(self.s.gen_freq_bits(), 0, 1000))
         self.assertEqual(expected, actual)
 
     def test_gen_freq_bits_lena(self):
-        expected = pickle.load(open("tests/assets/MartinM1_freq_bits_lena.p"))
+        expected = pickle.load(open(get_asset_filename("MartinM1_freq_bits_lena.p")))
         actual = list(islice(self.lena.gen_freq_bits(), 0, 1000))
         self.assertEqual(expected, actual)
 
@@ -39,7 +40,7 @@ class TestMartinM1(unittest.TestCase):
         self.maxDiff = None
         line_numbers = [1, 10, 100]
         for line in line_numbers:
-            file = open("tests/assets/MartinM1_encode_line_lena%d.p" % line)
+            file = open(get_asset_filename("MartinM1_encode_line_lena%d.p" % line))
             expected = pickle.load(file)
             actual = list(self.lena.encode_line(line))
             self.assertEqual(expected, actual)
diff --git a/pysstv/tests/test_sstv.py b/pysstv/tests/test_sstv.py
index 2ff5de1..1b6abc6 100644
--- a/pysstv/tests/test_sstv.py
+++ b/pysstv/tests/test_sstv.py
@@ -6,8 +6,9 @@ from mock import MagicMock
 from StringIO import StringIO
 import hashlib
 
-import sstv
-from sstv import SSTV
+from pysstv import sstv
+from pysstv.sstv import SSTV
+from common import get_asset_filename
 
 
 class TestSSTV(unittest.TestCase):
@@ -44,7 +45,7 @@ class TestSSTV(unittest.TestCase):
     # FIXME: Instead of using a test fixture, 'expected' should be synthesized?
     def test_gen_values(self):
         gen_values = self.s.gen_values()
-        expected = pickle.load(open("tests/assets/SSTV_gen_values.p"))
+        expected = pickle.load(open(get_asset_filename("SSTV_gen_values.p")))
         for e, g in izip(expected, gen_values):
             self.assertAlmostEqual(e, g, delta=0.000000001)
 
@@ -56,7 +57,7 @@ class TestSSTV(unittest.TestCase):
         # and having different results.
         # https://en.wikipedia.org/wiki/Quantization_%28signal_processing%29
         sstv.random = MagicMock(return_value=0.4)  # xkcd:221
-        expected = pickle.load(open("tests/assets/SSTV_gen_samples.p"))
+        expected = pickle.load(open(get_asset_filename("SSTV_gen_samples.p")))
         actual = list(islice(gen_values, 0, 1000))
         self.assertEqual(expected, actual)